Several Republicans were at odds with the president after a bipartisan gun control summit.

President Donald Trump hosted a televised session with lawmakers on Wednesday in which he asked Congress to send him a single bill to reduce gun violence.

The session came two weeks after the February 14 school shooting at Marjory Stoneman Douglas High School left 17 people dead. The survivors of the shooting have pushed for accountability and legislation, and Trump responded by expressing his willingness to address gun reform. But on Wednesday, back-and-forth arguments between Trump and members of both parties occasionally dominated the conversation.

During the four-hour bipartisan meeting, Trump signaled his support for strengthening background checks, raising the minimum age to buy some firearms, taking guns away from the mentally ill, and allowing “very talented people” to carry firearms on school campuses.

He used the 2016 Pulse Nightclub shooting that left 49 people dead as reasoning for allowing some people on school campuses to carry firearms. He said that if someone had a gun in the club the night 49 people were killed, “It wouldn’t have happened. Or certainly not to the extent it did.” (That claim is false.)

Trump’s preferred policies been well documented since the Parkland shooting. On February 22, he tweeted his support for background checks, mental health screening for gun owners, ending the sale of bump stocks, and raising the legal age to buy firearms.

“It would be so beautiful to have one bill,” Trump told lawmakers, as he made the case for a single, comprehensive reform package. But it’s still unclear what specific legislation he would actually support, and Republicans are skeptical of such a bill passing through Congress.

The president did give special mention to a bipartisan bill by Democratic senator Joe Manchin of West Virginia and Republican senator Pat Toomey from Pennsylvania, which failed with 54 votes in the Senate in 2013, according to CNN. The bill was originally created in response to the 2012 Sandy Hook Elementary School shooting, according to The Washington Post.

Trump said he "hasn't heard a lot about" the Manchin-Toomey bill, which is largely focused on bolstering the National Instant Criminal Background Check System (NICS). Trump asked Toomey if the proposal would raise the minimum age for firearms purchases. When Toomey said it wouldn't, Trump responded, “Because you're afraid of the NRA, right?”

However, with the backing of the president, the Manchin-Toomey bill could make a comeback. “It does feel as though the atmosphere has changed. It does feel to me as though there are members who were not willing to do something in the past that might be willing now,” Senator Toomey told The Hill. “I know for a fact that there are individual senators who have voted against Manchin-Toomey who have told me they are reconsidering.”

But Trump's fixation and Toomey's optimism may not translate into success in the legislature. As The Hill reported, Republican senators John Thune, Pat Roberts, Roy Blunt, and Marco Rubio all voiced concerns.

“Do you think he has any idea what’s in Manchin-Toomey?” a lawmaker who requested to remain anonymous asked The Hill. “As he gets more information he may not hold to that. What makes you think Manchin-Toomey will get more votes than it did before?”

Senate Majority Whip John Cornyn told The Washington Post that competing politics could kill the bill: “The problem on this issue is, there’s so many conflicting demands that nothing happens," he said Wednesday. Senator Cornyn called the president's summit "fascinating television."

Also on Wednesday, Trump responded to Vice President Mike Pence's concerns about how gun reform might affect due process by saying, "Take the gun first, go through due process second," as reported by CNN.

On Thursday morning, Trump tweeted about the meeting, supporting strengthened background checks, criticizing gun free zones, and demanding respect for the Second Amendment.